How we deal with these problems at Arcus
When we modify the movements by adding our in-house manufactured parts, a complete dissasembly of the chronograph mechanism is required. While we do this, we take the time to readjust all the eccentric screws, do a timing test to ensure everything is running properly, and adjust the spring that rests against the column wheel to control its position. These adjustments ensure that the chronograph is running properly and that the pusher is much more pleasant to operate than a standard ST-19.
To learn more about the quality control processes we have in place at Arcus, please see the Warranty page.
The ST-19 base movement is extremely robust and in general completely problem free. Poor regulation of the eccentric screws found in the chronograph will have devastating consequences on the performance and life of the movement. Of all the "bad" movements we've seen at Arcus, all the faults were easily rectified by taking the time to readjust the chronograph properly. Like with all watches, the internet has horror stories about this movement. However, when one is meticulous about quality control, this is a movement that can last a lifetime and is an incredible bargain for a column wheel powered chronograph.